Mosquito season in Aransas County, TX: when it starts and ends

Mosquito months in Aransas County

In a normal year mosquito season in Aransas County, TX starts around January 8 and ends around January 4, about 52 weeks.

What to do in Aransas County, and when

Start tipping out standing water weekly by December 25.
Book any yard treatment for early January, ahead of the August peak.
Repellent can go away after January 4.
No West Nile cases since 2016, so bites in Aransas County are a nuisance; check window screens.

Aransas County against the rest of TX

Aransas County has the 6th longest season of 254 TX counties, at 361 days against 365 in Cameron County and 191 in Lipscomb County. Its mean temperature is 72.6°F.

Willacy County: January 7 to January 5 (363 days, 0 WNV)
Zapata County: January 5 to January 1 (361 days, 0 WNV)
Jim Wells County: January 15 to January 6 (356 days, 1 WNV)
Nueces County: January 11 to January 1 (355 days, 14 WNV)

West Nile in Aransas County

CDC ArboNET lists no human West Nile cases for Aransas County from 1999 to 2025, though virus turned up in birds, mosquitoes or horses in 2 of those years.

See how the dates are worked out, and where mosquitoes never stop.